How do you simplify #2/3 + 1/5 - 1/2#?
5 will be a factor of any number (apart from 0) that end in 5 or 10
Unfortunately a number ending with 5 can not be divided exactly by 2. So the common denominator has to be a one of the 'tens'
Multiply a number by 1 and you do not change its value. You can however change the way it looks.
The inherent value is still three but it looks different.